CN109556708A - Larger Dynamic range scene imaging brightness measuring device for camera and imaging luminance measuring method - Google Patents
Larger Dynamic range scene imaging brightness measuring device for camera and imaging luminance measuring method Download PDFInfo
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- CN109556708A CN109556708A CN201910007146.1A CN201910007146A CN109556708A CN 109556708 A CN109556708 A CN 109556708A CN 201910007146 A CN201910007146 A CN 201910007146A CN 109556708 A CN109556708 A CN 109556708A
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- attenuator
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- control module
- image acquisition
- luminance meter
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- 238000003384 imaging method Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 51
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 238000010586 diagram Methods 0.000 description 6
- 238000005286 illumination Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0418—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using attenuators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The present invention relates to a kind of Larger Dynamic range scene imaging brightness measuring device for camera, which includes: image acquisition units, luminance meter, attenuator wheel and control module；Wherein, attenuator wheel is set in front of the light incident window of image acquisition units and luminance meter, is fixed with multiple optical attenuators on attenuator wheel；When work, the optical attenuator rotates under the control of control module；Wherein, the front refers to: incident ray opposite direction in front position；Control module controls image acquisition units and luminance meter according to the instruction of host computer, and the revolving speed of the optical attenuator is adjusted according to the present intensity information that luminance meter acquires.The device, which can be applied, carries out imaging luminance measuring in Larger Dynamic range scene.The invention further relates to a kind of imaging luminance measuring methods, and optical attenuator is rotated when by the way that attenuator wheel and work being arranged in front of imaging brightness meter to realize the uniform irradiation of light, solves the problems, such as the brightness measurement of Larger Dynamic range scene.
Description
Technical field
The present invention relates to field of optical measurements more particularly to a kind of Larger Dynamic range scene imaging brightness measuring device for camera and at
Image brightness measurement method.
Background technique
Luminance meter is a kind of metrical instrument for surveying light and colour examining, and imaging brightness meter is to increase figure on the basis of luminance meter
It is the product that camera and luminance meter are combined into one as acquisition unit, it can obtain the image information and brightness letter of target simultaneously
Breath has a wide range of applications in various qualitatively and quantitatively analyses.
In measurement process, often encounters the target of different brightness or encounter that illumination condition is complicated, target surface is bright
The larger situation of dark contrast, this just needs imaging brightness meter to have (the i.e. illumination and brightness wide variation of Larger Dynamic range scene
Scene) brightness measurement and Image Acquisition ability.Therefore, against the above deficiency, it is desirable to provide one kind can be applied to Larger Dynamic
The imaging luminance measuring device of range scene.
Summary of the invention
The technical problem to be solved by the present invention is to how design a kind of brightness of image that can be applied to Larger Dynamic range scene
Measuring device and method.
In order to solve the above-mentioned technical problem, in one aspect, the present invention provides a kind of Larger Dynamic range scene imaging is bright
Spend measuring device.
The Larger Dynamic range scene imaging brightness measuring device for camera of the embodiment of the present invention can include: image acquisition units, brightness
Meter, attenuator wheel and control module；Wherein, before attenuator wheel is set to the light incident window of image acquisition units and luminance meter
It is square, multiple optical attenuators are fixed on attenuator wheel；When work, the optical attenuator turns under the control of control module
It is dynamic；Wherein, the front refers to: incident ray opposite direction in front position；Control module is controlled according to the instruction of host computer
Image acquisition units and luminance meter, and the revolving speed of the optical attenuator is adjusted according to the present intensity information that luminance meter acquires.
Preferably, control module can be further used for adjusting the revolving speed of the optical attenuator according to the instruction of host computer.
Preferably, attenuator wheel can be further used for feeding back current rotating speed to control module；Control module can be used further
PID control is carried out to the rotation of attenuator wheel in the current rotating speed fed back using attenuator wheel.
Preferably, attenuator wheel can further comprise: install the piece wheel carrier of the optical attenuator, the driving optics declines
Subtract the power unit of piece rotation, the encoder of the measurement optical attenuator revolving speed and connection sheet wheel carrier shaft and power unit
The deceleration unit of output shaft.
Preferably, deceleration unit can include: intermeshing first gear and second gear；Wherein, first gear and dynamic
Power unit exports axis connection, and second gear is connected with piece wheel carrier shaft, and the number of teeth of first gear is less than second gear.
Preferably, described device can further comprise: the imaging object between image acquisition units and attenuator wheel is arranged in
Mirror.
Preferably, image acquisition units are charge coupled device ccd camera, and power unit is stepper motor, and encoder is
Photoelectric code disk.
On the other hand, the present invention provides a kind of imaging luminance measuring method.
The imaging luminance measuring method of the embodiment of the present invention includes: to be arranged in front of the light incident window of brightness of image instrument
Attenuator wheel；Wherein, image acquisition units, luminance meter and control module are provided in brightness of image instrument；It is fixed on attenuator wheel
There are multiple optical attenuators；When work, the optical attenuator rotates under the control of control module；The front refers to:
Incident ray opposite direction in front position；Image acquisition units and brightness are controlled based on the instruction of host computer using control module
Meter, the present intensity information based on luminance meter acquisition adjust the revolving speed of the optical attenuator.
Preferably, the method further includes: the optics is adjusted based on the instruction of host computer using control module and is declined
Subtract the revolving speed of piece.
Preferably, attenuator wheel is further used for feeding back current rotating speed to control module；And the method is further wrapped
It includes: PID control being carried out to the rotation of attenuator wheel based on the current rotating speed that attenuator wheel is fed back using control module.
Above-mentioned technical proposal of the invention has the advantages that in embodiments of the present invention, by image acquisition units
The rotation of optical attenuator comes real when being equipped with attenuator wheel and the work of multiple optical attenuators with setting in front of luminance meter
The uniform irradiation of existing light, to solve the problems, such as the brightness measurement of Larger Dynamic range scene.It in actual use, can be according to bright
The luminance information that degree meter acquires in real time adjusts the revolving speed of optical attenuator, so as to carry out brightness survey to the target of different brightness
Amount complicated, the biggish working environment of target surface light and shade contrast can also measure illumination condition.Meanwhile the present invention exists
Attenuator wheel provides the installation site of plurality of specifications attenuator, light intensity attenuation ratio is selected by revolving fragment wheel, to measure difference
The target object of brightness.
Detailed description of the invention
Fig. 1 is the component part schematic diagram of the Larger Dynamic range scene imaging brightness measuring device for camera of the embodiment of the present invention；
Fig. 2 is the component part schematic diagram of the attenuator wheel of the embodiment of the present invention.
Fig. 3 is the rear panel schematic diagram of the Larger Dynamic range scene imaging brightness measuring device for camera of the embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is the component part schematic diagram of the Larger Dynamic range scene imaging brightness measuring device for camera of the embodiment of the present invention.Such as
Shown in Fig. 1, above-mentioned apparatus includes: image acquisition units, luminance meter, attenuator wheel and control module.
Wherein, image acquisition units can be charge coupled device ccd (Charge Coupled for acquiring image
Device) camera or complementary metal oxide semiconductor CMOS (Complementary Metal Oxide
Semiconductor) camera etc..Luminance meter is used to obtain the luminance information of target, single-chip microcontroller can be used in control module, scene can
The modes such as programming gate array FPGA (Field-Programmable Gate Array) realize that specific effect will be situated between later
It continues.Luminance meter is fixed using independent bracket, to can adjust its relative position between camera optical axis.
Particularly, attenuator wheel is set in front of the light incident window of image acquisition units and luminance meter.Wherein, front
Refer to incident ray opposite direction in front position, i.e., incident ray first pass around attenuator wheel using image acquisition units with
And luminance meter.Multiple optical attenuators are fixed on attenuator wheel, it will be understood that optical attenuator can be realized incident laser energy
Fixed proportion decaying, to measure the target of different brightness.To meet the measurement demand to Larger Dynamic range target, in this hair
In bright embodiment, can be equipped with one times, two times, five times, ten times, 20 times, 50 times (in this field, n times of attenuator can make incidence
One, n of the n times side point that the strength retrogression of light is 2 is integer) etc. a variety of multiplying power attenuators, it is contemplated that measurement object brightness
It is required that above-mentioned optical attenuator can be selected neutral density attenuator, such attenuator has that spectral region is wide and plateau
Feature.The effective clear aperture of attenuator can be determined as 55 millimeters according to object lens type selecting.When work, optical attenuator is in control module
Control under rotated, processing is synchronized to the acquisitions of image acquisition units and luminance meter and optical attenuator rotation
Afterwards, one optical attenuator is just aligned image acquisition units when image acquisition units and luminance meter can be made to carry out signal acquisition
And the light incident window of luminance meter, so that blocking for incident ray will not be caused.
It is appreciated that broad arrow represents light propagation, the thin arrow representation signal of black and data dissemination in Fig. 1.
Fig. 2 is the component part schematic diagram of the attenuator wheel of the embodiment of the present invention.Referring to fig. 2, the embodiment of the present invention declines
Subtract piece wheel can include: multiple optical attenuators (23 show the placement location of optical attenuator), the piece for installing optical attenuator
The encoder 24 and connection sheet of power unit 21, measurement optical attenuator revolving speed that wheel carrier 22, driving optical attenuator rotate
The deceleration unit of wheel carrier shaft and power unit output shaft.Wherein, power unit 21 can choose various motor such as stepper motor,
Encoder 24 can be more common photoelectric code disk, and deceleration unit may include intermeshing first gear 26 and the second tooth
Wheel 25；Wherein, first gear 26 and power unit 21 export axis connection, and second gear 25 is connected with 22 shaft of piece wheel carrier, and first
The number of teeth of gear 26 is less than second gear 25, so as to carry out deceleration control to the rotation of piece wheel carrier.In concrete scene, reduction ratio
It can be designed as 3:1,22 working speed of piece wheel carrier is generally higher than a revolution per second.Encoder 24 passes through yielding coupling and piece wheel carrier
The connection of 22 shafts, real-time measurement piece wheel carrier 22 rotate angle, guarantee 22 accurate positioning of piece wheel carrier.
In practical application, control module can be according to the revolving speed of the instruction adjustment optical attenuator of host computer.Specifically, upper
After machine instruction is transmitted to control module by wired mode or wireless mode, control module is forwarded instructions to by luminance meter
Thus the driving equipment of stepper motor carries out the rotation control of piece wheel carrier, needed for being directed at image acquisition units or luminance meter
Optical attenuator.Meanwhile control module can also be according to the present intensity information adjust automatically optical attenuator that luminance meter acquires
Revolving speed.Specifically, after present intensity information is sent control module by luminance meter, control module judge present intensity whether compared with
It (is greater than threshold value) greatly or smaller (being, for example, less than another threshold value): being transmitted to stepping electricity through luminance meter if so, issuing instruction
The driving equipment of machine, to increase or reduce the revolving speed of piece wheel carrier, thus needed for being directed at image acquisition units or luminance meter
Optical attenuator.It is appreciated that when adjustment sheet wheel carrier revolving speed, control module can exist according to each optical attenuator in practical application
The collection period of the specific location of piece wheel carrier, image acquisition units and luminance meter carrys out the revolving speed of adjustment sheet wheel carrier, makes Image Acquisition
Unit or luminance meter are directed at required optical attenuator when acquiring light.
In addition, control module when indicating piece wheel carrier is with a rotational speed, in order to mention high control precision, can also carry out PID
It controls (i.e. PID control parameter).Specifically, attenuator wheel can feed back current rotating speed to control module, and control module utilizes
The current rotating speed of attenuator wheel feedback carries out PID control to the rotation of attenuator wheel.
In some embodiments, control module controls image acquisition units and luminance meter according to the instruction of host computer, such as
Image resolution ratio, the image size etc. of image acquisition units are set.Image acquisition units acquired image and brightness measurement
The luminance information measured can be controlled module and send to host computer.
In practical application, image-forming objective lens can be also set between image acquisition units and attenuator wheel to improve into image quality
Amount.
In concrete scene, the front panel of Larger Dynamic range scene imaging brightness measuring device for camera structure cabinet can be adopted for image
Two-way window is arranged in the work requirements for collecting unit and luminance meter, and window member design is independent module, is easily installed replacement, full
The use demand of sufficient external field environment.Top of the box can design dismountable cover plate, can replace to image-forming objective lens after opening cover board.
Settable four trunnions of box baseplate, for carrying out Larger Dynamic range scene imaging brightness measuring device for camera and circumferential tabletop of platform
Connection.
Fig. 3 is the rear panel schematic diagram of the Larger Dynamic range scene imaging brightness measuring device for camera of the embodiment of the present invention.Referring to
Fig. 3 is arranged power supply indicator on rear panel and status indicator lamp, the auxiliary as working state of system is shown.In addition it is arranged one
A connector for being used for transmission Camera Link (camera connection) data, an aviation plug for being used for transmission control signal connect
Device is connect, one is used for the binding post of equipment ground for the 220V AC power interface of equipment power supply and one.
In embodiments of the present invention, it is further provided a kind of imaging luminance measuring method, steps are as follows for execution:
Firstly, attenuator wheel is arranged in front of the light incident window of brightness of image instrument；Wherein, it is arranged in brightness of image instrument
There are image acquisition units, luminance meter and control module；Multiple optical attenuators are fixed on attenuator wheel；When work, the light
Attenuator is learned to rotate under the control of control module；The front refers to: incident ray opposite direction in front position.
Secondly, controlling image acquisition units and luminance meter based on the instruction of host computer using control module, it is based on luminance meter
The present intensity information of acquisition adjusts the revolving speed of the optical attenuator.
In concrete application, the method can include: the optics is adjusted based on the instruction of host computer using control module and is declined
Subtract the revolving speed of piece.
In addition, in embodiments of the present invention, attenuator wheel can feed back current rotating speed to control module；The method can wrap
It includes: PID control being carried out to the rotation of attenuator wheel based on the current rotating speed that attenuator wheel is fed back using control module.
In conclusion in the technical solution of the embodiment of the present invention, by being set in front of image acquisition units and luminance meter
The uniform photograph of optical attenuator rotated to realize light when setting the attenuator wheel for being equipped with multiple optical attenuators and work
It penetrates, to solve the problems, such as the brightness measurement of Larger Dynamic range scene.In actual use, it can be acquired in real time according to luminance meter
Luminance information adjusts the revolving speed of optical attenuator, can also be to light so as to carry out brightness measurement to the target of different brightness
It is measured according to complicated condition, the biggish working environment of target surface light and shade contrast.Meanwhile the present invention is more in the offer of attenuator wheel
The installation site of kind specification attenuator selects light intensity attenuation ratio by revolving fragment wheel, to measure the target object of different brightness.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of Larger Dynamic range scene imaging brightness measuring device for camera characterized by comprising image acquisition units, luminance meter,
Attenuator wheel and control module；Wherein,
Attenuator wheel is set in front of the light incident window of image acquisition units and luminance meter, is fixed on attenuator wheel multiple
Optical attenuator；When work, the optical attenuator rotates under the control of control module；Wherein, the front refers to: entering
Penetrate light opposite direction in front position；
Control module controls image acquisition units and luminance meter according to the instruction of host computer, and according to the current bright of luminance meter acquisition
Degree information adjusts the revolving speed of the optical attenuator.
2. the apparatus according to claim 1, which is characterized in that control module is further used for the instruction tune according to host computer
The revolving speed of the whole optical attenuator.
3. the apparatus according to claim 1, which is characterized in that
Attenuator wheel is further used for feeding back current rotating speed to control module；And
Control module is further used for the current rotating speed fed back using attenuator wheel and carries out PID control to the rotation of attenuator wheel.
4. the apparatus according to claim 1, which is characterized in that attenuator wheel further comprises: installing the optical attenuator
The piece wheel carrier of piece, the power unit of the driving optical attenuator rotation, the measurement optical attenuator revolving speed encoder with
And the deceleration unit of connection sheet wheel carrier shaft and power unit output shaft.
5. device according to claim 4, which is characterized in that deceleration unit includes: intermeshing first gear and
Two gears；Wherein, first gear is connect with power unit output shaft, and second gear is connected with piece wheel carrier shaft, first gear
The number of teeth is less than second gear.
6. the apparatus according to claim 1, which is characterized in that described device further comprises: being arranged in Image Acquisition list
Image-forming objective lens between member and attenuator wheel.
7. device according to claim 4 or 5, which is characterized in that image acquisition units are charge coupled device ccd phase
Machine, power unit are stepper motor, and encoder is photoelectric code disk.
8. a kind of imaging luminance measuring method characterized by comprising
Attenuator wheel is set in front of the light incident window of imaging brightness meter；Wherein, image is provided in imaging brightness meter to adopt
Collect unit, luminance meter and control module；Multiple optical attenuators are fixed on attenuator wheel；When work, the optical attenuator
It rotates under the control of control module；The front refers to: incident ray opposite direction in front position；
Image acquisition units and luminance meter are controlled based on the instruction of host computer using control module, based on the current of luminance meter acquisition
Luminance information adjusts the revolving speed of the optical attenuator.
9. according to the method described in claim 8, it is characterized in that, the method further includes:
The revolving speed of the optical attenuator is adjusted based on the instruction of host computer using control module.
10. method according to claim 8 or claim 9, which is characterized in that attenuator wheel is further used for feeding back to control module
Current rotating speed；And the method further includes:
PID control is carried out to the rotation of attenuator wheel based on the current rotating speed that attenuator wheel is fed back using control module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910007146.1A CN109556708A (en) | 2019-01-04 | 2019-01-04 | Larger Dynamic range scene imaging brightness measuring device for camera and imaging luminance measuring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910007146.1A CN109556708A (en) | 2019-01-04 | 2019-01-04 | Larger Dynamic range scene imaging brightness measuring device for camera and imaging luminance measuring method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113810618A (en) * | 2021-10-29 | 2021-12-17 | 北京环境特性研究所 | Image acquisition device and acquisition system |
| CN116962860A (en) * | 2023-09-21 | 2023-10-27 | 深圳市利和兴股份有限公司 | Image data processing system based on HDR highlight colorimeter |
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| CN206601144U (en) * | 2017-03-09 | 2017-10-31 | 北京航天长征飞行器研究所 | It is a kind of to strengthen the system that optical detection system resists strong light interference |
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| US6507419B1 (en) * | 1999-03-23 | 2003-01-14 | Digilens, Inc. | Illumination system using optical feedback |
| CN102576071A (en) * | 2009-09-11 | 2012-07-11 | 罗伯特·博世有限公司 | Photon detector with an immobilisable photon-sensitive element, in particular spad, and distancing measuring device comprising said type of photon detector |
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Application publication date: 20190402 |